﻿    <p>An <em>IfcEventType</em> defines a particular type of event that may be specified.</p>
    <blockquote class="history">
HISTORY&nbsp; New entity in IFC4
    </blockquote>
    <p>An <em>IfcEventType</em> provides for all forms of types of event that may be specified.</p>
    <p>Usage of <em>IfcEventType</em> defines the parameters for one or more occurrences of <em>IfcEvent</em>. Parameters may be specified through property sets that may be enumerated in the <em>IfcEventTypeEnum</em> data type or through explicit attributes of <em>IfcEvent</em>. Event occurrences (<em>IfcEvent</em> entities) are linked to the event type through the <em>IfcRelDefinesByType</em> relationship.</p>